Hand operated grease gun



Nov. 4, 1958 s. LuclEN HAND'OPERATED GREASE GUNA Filed Jue 12, 1956Stan/ey Luc/'en INVENTOR.

Attorneys United States Patent 2,858,962 HANDv OPERATED GREASE GUNStanley Lucien, Unity, Maine Y Application June 12, `19.56, Serial No.590,945

s Claims. (c1. zzz-sz) Y This invention relates to hand operated greaseguns and particularly to a grease gun `wherein an ordinary can of greaseis inserted and functions as a cartridge from which the grease is used.

An object of the present vinventionis to provide an attachment for thenozzle and valve end of a grease gun, the attachment being especiallyconstructed to accommodate anordinary'can of grease and being tted withmeansto pierce"the bottom of the can and to push the grease through the'hole that is so formed in the bottom of the can, whereby it may beapplied through the standard va1v and grease gemaal@- `A further objectof the present invention is to provide a practical device of this naturewherein the means for piercing the bottom of the can are so constructedthat they function as a device for withdrawing the can from the greasegun attachment in an easy and effective manner. Should the user fail totake advantage of this, the device is so constructed that upon openingof the casing, the end of the grease can protrudes` outwardly providinga hand grip for manual removal of the grease can.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperationas more fully hereinafter described and claimed, referencebeing had to the accompanying drawing forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

Figure l is an elevational view of a grease gun attachment made inaccordance with the principles of the invention;

Figure 2 is a sectional view on the line 2 2 of Figure 1;

Figure 3 is a transverse sectional view taken on the line 3-3 of Figure2; and

Figure 4 is a sectional view taken on the line 4-4 of Figure 2.

In practicing the invention; there is a standard hand operated greasegun valve body provided with an ordinary nozzle 12 at the end of a tube14 which operatively connects to the valve body 10. The nozzle 12 isadapted to tit on grease ttings of motor vehicles, but could besubstituted in favor of any standard tip. The Valve body has a valvestem 16 protruding therefrom, this valve stem being operated by a lever18 that ismounted on link 20. The valve operating linkage merely typiesone standard valve operating mechanism which may be adopted. Aninternally threaded collar 22 is on the valve body 10 and islcustomarily threaded onto the body of the grease gun.

Attachment 24 which exemplifies the invention, has a neck 26 that isexternally threaded in order to fit into the collar 22 and to attachthereto. The attachment comprises a casing that is made of an innercylindrical part 28 and an outer cap or closure 30 threaded as at 32onto the open outer end of the inner part 28. Yieldable seat, as rubberor plastic pad 34 is located in a reduced part 36 of the casing near theneck 26. There is a central passage 38 in the seat 34, and the seatfunctions to support the can 40. This can is a standard container withinwhichgre'ase is stored and from which it is used. It has a cylindricalside wall, a closure that is removed before inserting in the casing 28and a bottom wall 42. This bottom wall is adapted to be pierced in theuse of the attachment.

The outerend-part 30 of the casing has a shoulder 44 onwhich therim ofthe can 40 seats when the two parts lof the can ofl grease. Thisisaccomplished by pushing the handle 521inwardly after placing the can 40in the attachment. YThen after the hole vis pushed in the can, thehandle 52 is rotated, preferably 90, so that the barbs 55 and 56yareturned at right angles to the slit formed as lateral lextensions `of thehole 58'by barbs 55 and 56. This makes the task of removing the emptycan from the attachment quite simple inasmuch as it is only necessary todetach part 30 from part 28 of the casing and pull on the handle 52.This withdraws the can from the part 28 of the casing.

Piston 62 is mounted for sliding movement on the rod 48 and has a guide64 through the bore of which rod 38 extends. A spring 66 seats on thepiston and on the inner surface of the part 30 of the casing. Thisspring is under a compression load when the can of grease is placed inthe attachment and the part 30 of the casing threaded onto the part 28.Then, when the can bottom is pierced in the manner described previouslythe grease in the can rushes through the hole 58 and into the valve body10. Upon opening the valve 10 the grease issues through nozzle 12,thereby releasing a small part of the load from spring 66. Continuedoperation of the valve depletes the supply of grease in the same manner,the piston 62 advancing in the can until the grease is used and the canbecomes emptied. Thereafter the can is withdrawn from the attachment inthe manner described and the attachment is ready to receive another suchcontainer of grease.

The foregoing is considered as illustrative only of the principles ofthe invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction and operation shown anddescribed, and accordingly, all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention asclaimed.

What is claimed as new is as follows:

l. For use with a grease gun valve that has means to attach a bodythereto, an attachment comprising a casing in which to accommodate a canof grease, a piston in said casing and operable in the can of grease tourge the grease towards the bottom of the can, a rod in said casing andhaving a pointed end with barbs extending radially a greater distancethan the diameter of said rod with which to pierce the bottom of the canand after rotation to withdraw the can from the casing upon depletion ofthe supply of grease therein, and resilient means biasing said piston insaid casing in one direction.

2. For use with a grease gun valve that has means to attach abodythereto, an attachment comprising a casing Patented Nov. 4, 1958 inwhich to accommodate a can of grease, a piston in said casing andoperable in the can of grease to urge the grease towards the bottom ofthe can, a rod in said casing and having a pointed end with barbsextending radially a greater distance than the diameter of said rod withWhich to pierce the bottom ofv the can and after rotation to Withdrawthe can from the casing upon depletion of the supply of grease therein,and resilient means `biasing said piston in said casing in onedirection, said casing having a reduced part, a resilient seat for thecan in said reduced part and having a passage through which the greaseis adapted to pass.

3. The attachment of claim 2 wherein said casing is made of two partsthat are separably connected together, and one of said parts having ashoulder against which the open end of the can of grease is adapted toseat.

4. In combination with a valve having a valve body, an attachment tosupply said valve `body with grease under pressure, saidV attachmentcomprising a casing, a resilient seat in said casing and having apassage for the grease, said 4seat being adapted to support the bottomof a can of grease, means in said casing for holding the can of greaseseated firmly on said resilient seat, a rod reciprocably carried in saidcasing, means on the end of said rod for piercing a hole in the bottomof the canand for withdrawing the can fromv the casing, the lastmentioned means being operable in the grease passage, and resilientlybiased means in said casing and adapted to rnove into the can of greasefor applying pressure in a direction to force it through said hole inthe bottom of the can.

5. In combination with a valve having a valve body, an attachment tosupply said valve body with grease under pressure, said attachmentcomprising a casing, a resilientseat in said casing and having a passagefor the grease, said seat being adapted to support the bottom of a canof grease, means in said casing for holding the can of grease seatedrmly on said resilient seat, a rod reciprocably carried in said casing,means on the end of said rod for piercing a hole in the bottom of thecan and for withdrawing the can from the casing, the last Y mentionedmeans being operable in the grease passage,

and resiliently biased means in said casing and adapted to move into thecan -of grease for applying pressure in a direction to force it throughsaid hole in the bottom of the can, the last mentioned means including apiston that has va central aperture through which said rod ispassed, anday spring reacting on said piston and a part of said casing constantlybiasing said piston in one direction in said casing.

References Cited linthe file of this patent UNITED STATES PATENTS1,476,227 VScott Dec. 4, 1923` 1,621,109 Drummond Mar. 15, 19271,984,651 Meves Dec. 18, 1934 FOREIGN PATENTS 589,654 France Feb. 26,1925

